With the flexibility of DNN, you can make modules in just about any fashion you want to. If you want to have multiple usercontrols that do different things and have tabs (in your module) switch between them, that can be done.

If you want to use edit controls via the action menu (like where the delete and setting module options are at) to add and edit information, that can work too.

I've done both methods, each have their pros and cons. 

For how to create your module; It depends on how you design it.
I have systems where I have separate modules for nearly everything and others where almost everything is tied together in a single module.
Both work great. :)

 http://www.adefwebserver.com/DotNetNukeHELP/Misc/ModuleNavigationOptions.htm

That link (adefwebserver.com is a good reference and resource site in general) has 4 different types of navigation for the module. They all, effectively allow the same thing, but they do it in different ways, obviously.

It has helped me on occasion, and will hopefully help you too.